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Built for professionals who push the limits in extreme conditions, the MUDMAN GDG-B100 from the MASTER OF G line is ready to support around-the-clock activities, from extreme environments to everyday life. Inspired by the protective structures used on off-road vehicles and survival gear, the watch features a bumper guard design with an intricate multi-component construction. It delivers the shock-, dust-, and mud-resistant structure that defines the MUDMAN identity while also providing a superbly comfortable fit on the wrist. The MIP LCD delivers outstanding readability, even in direct sunlight. The red LED backlight enhances watch visibility during evening activities while also helping preserve the eyes’ natural adaptation to the dark. Equipped with a step tracker and Smartphone Link, the watch also supports training. In addition to stopwatch timing, it measures distance, speed, pace, and calories burned, and offers lap time memory and an interval timer.
Training Function Display of distance, speed, pace and other calculated values based on accelerometer, auto/manual lap times, Auto Pause, target alert setting (time, calories burnt) on/off, training display customisation (elapsed time, distance, pace, lap time, lap distance, lap pace, average pace, speed, average speed, calories burnt)
Life log data Daily data display (step count), Monthly data display (running distance)
Training Data (Up to 100 runs, up to 140 lap times per run) Elapsed time, distance, pace, calories burned
World time 38 time zones* (38 cities + Coordinated Universal Time), daylight saving on/off, auto summer time (DST) switching *May be updated when connected to a smartphone.
Stopwatch
1-second stopwatch Measuring capacity: 99:59'59'' Measuring modes: Elapsed time, split time
Timer
Countdown timer Timer for interval measurement (up to five time settings) Measuring unit: 1 second Input range: 00'00" to 60'00" (1-second increments) Others: Auto-repeat (number of repeats settable from 1 to 20)
Alarm/hourly time signal
4 daily alarms with snooze
Light
LED light Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light color
LED: Red
Calendar
Full auto-calendar (to year 2099)
Mute feature
Button operation tone on/off
Energy saving feature
Power Saving (Display goes blank to save power 3 hours every day.)
Accuracy
Accuracy: ±15 seconds per month (with no mobile link function)
Other features
12/24-hour format
Flight mode
Regular timekeeping: Hour, minute, second, am/pm, month, date, day
User profile creation
Aeroplane mode
Vibration on/off
Memory-in-pixel (MIP) LCD
Screen Off Function
In addition to our 30 day returns policy, all items purchased from 1st October 2026 can now be returned until 15th January 2027, terms apply.
We aim for you to be absolutely delighted with your purchase and therefore offer you 30 days to change your mind on your purchase. You may do this by using the form provided with your order or otherwise. We will provide a refund of all payment received (not including delivery upgrades), usually within 2 working days of receiving your return (it may take a little longer during busy periods or for more complex returns). This will be made to the original payment method. For most payment methods it will take 3-5 working days for this to show on your statement.
Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy.
Returns are free on all UK orders. For orders under £500, you may generate a free tracked and insured returns label on the Royal Mail website (opens in a new window). You can print this label and send it back at any local Post Office at no cost to yourself. It is also possible to have the label printed at Post Office using the QR code from the confirmation email. Please retain the proof of postage receipt. Unfortunately we are unable to refund return postage for orders under £500 sent back by other methods, so we recommend printing the free postage label provided. For orders from £500 to £2,500, the Royal Mail label does not cover the value of the item, so please send it back by Royal Mail Special Delivery, insured for its full value, and we will reimburse the postage separately (please keep your proof of postage — full details are on your receipt), or contact us and we can arrange a collection. For orders over £2,500, please contact us and we will arrange the return for you. For international returns, you will need to bear the cost of returns postage. Please ensure the watch is returned to us in an unworn, new condition with all the original packaging (manufacturer's manual and guarantee if applicable). Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy. We reserve the right to make deductions for unnecessary damage caused to the product by yourself.
For UK orders we are also able to offer an exchange to a different product if required, please specify this when returning your product. For international orders, please return the item for a refund and place a new order for the product you would like.
If a fault develops with a watch that is outside of the 30 day returns period or is no longer in a new condition the watch can be returned to the manufacturer under the terms of the guarantee (we are an official UK dealer for all brands on our website) so that they can rectify any issues. For more information please see our returns policy page.
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© 2026 First Class Watches
First Class Watches is the trading name of First Class Watches Limited, 9 Warwick Road, Kenilworth, Warwickshire, CV8 1HD. Company Reg. 06197115. UK VAT Reg. GB172671009. First Class Watches Limited acts an authorised credit broker and not a lender who offers credit from different providers, including PayPal Credit and Secure Trust Bank PLC trading as V12 Retail Finance. First Class Watches Limited is authorised and regulated by the Financial Conduct Authority. Our FCA registration number is 688157. ** Credit is provided subject to affordability, age and status. Minimum spend applies. PayPal Credit and PayPal Pay in 3 are trading names of PayPal UK Ltd, 76 Upper Ground, London, SE1 9PZ. Klarna is a trading name of Klarna Bank AB (publ). Sveavägen 46, 111 34 Stockholm, Sweden. V12 Retail Finance is a trading name of Secure Trust Bank PLC, One Arleston Way, Solihull, B90 4LH. The example below represents the typical costs of using PayPal Credit as a standard funding method. Interest on your instalment offer is fixed for its duration. See terms for more details. Full Representative Example: Representative 23.9% APR (variable), Purchase interest rate 23.9% p.a. (variable), Assumed credit limit £1,200.00.