And the pre-war ones were all "dull aluminum" – the decals were the only color.
Looks like you found your model/serial #! I don’t have my Johnson serial # breakdown handy, I think the "TS-20" may have been offered both pre and post war. (The serial # will nail it down.) Also be interested to know if there is a # stamped on the block above where the leg and powerhead mount. I’ve seen a couple of TSs made out of regular TDs.