Most of the old MG's started with the number 251.
Numbers below 251 were
protatotypes. Later on, numbers started at 101.
Army electronics from before 1945 often repreated serial numbers.
To really confuse the issue, some old radio manufacturers (Scott, I
think) used random serial numbers. Each time a new radio came off the
line, a guy would look in a big book, find a num,ber that was not used,
stamp the plate, then cross out the number.
So don't trust serial numbers.
William Donzelli
aw288(a)osfn.org