Yes your’s should start MB then the serial number if you can post numbers I’ll try and date it for you
MB denotes briggs & stratton engine
MK kohler engine
MV Villiers engine (there were only 10 of these made)
Genuine Wentworths have serial numbers that start with the letter R &100 onwards they are very few & far between I only know of 4 mine in pictures has serial number R119