My Underwood Noiseless 77 is serial number 621423 and is from 1933 – only two years after Remington began to make them for Underwood.
When I found this typewriter, it had obviously been in a wet place – a basement perhaps? The leatherette on the case is pulling away in many places. The typewriter itself had numerous small rust spots underneath. Thankfully I found it before the rusting had done real damage.
The primary problem was the drawstring (the string that pulls the carriage along as you type) had broken. It’s always a problem to find a suitable material. Some folks have used the cords from mini-blinds, some use nylon cord, and some have even suggested using gut violin strings. On this machine I’ve tried a non-stretch fishing line. Only use will determine if it holds to it’s non-stretch claim.