Hi JonoB,
SB 17" mower. There is no seriel plate on the mower, is there anywhere else on it where the model.etc is etched on.
Would have of liked to have replaced the ID plate but guess there is no way too without its ID info.
I've never seen anywhere else that the ID numbers are on these mowers.
You can buy a new ID plate on eBay and stamp it , 45 .The numbers just after 45 (058) in the image below I'd
say is for briggs & stratton motor so you would need to look for a tecumseh 4 stroke number off another mower plate,
then the last numbers maybe just how many made eg (0000001 to 2 million 140 thousand 3 hundred and 33 or 2140333) The last number just make up a number around the year your mower looks to be from by looking at
another plate.
Cheers
Max.