The machine dates to 1936, and I've never seen the bakelite button pedals with early machines. I think it was introduced closer to 1950, but I have never found a specific date. They pedals are common with the later the stitch length lever version (yours have the turn nob). The knee controller in the picture is a dual function, and the pedal can be taken out. The early speed controllers were different, the inner parts were porcelain, and a bit larger than the later versions. The early Singer pedals I have seen, were shaped like the sole of a shoe.
The cabinet might be a later replacement (because of the controller type), the 1930s machines I have seen usually comes in a bent wood case, and some came in a black/brown suit case. The spool pin on top is missing, but it can be replaced.
The bent wood and suit case versions sells for about 60 dollars here, in reasonably good condtion. A machine in cabinet tend to fetch a bit more. They are not always easy to sell either way, but at the local charity shop they go fast as soon as the price drops (they often start at $150 and may not sell until the price reaches $40 three weeks later). The 3/4 size cabinet for the 99 can be hard to find if you look for it, it can take quite some time and dedication to track one down. A 99 can be found almost at any time. It's all about reaching the person looking for a machine like this, they are worth the money, but only to those who use it.
Don't leave the green tape on for too long. The safest tape I think is electrical tape.
Last edited by Mickey2; 06-07-2019 at 10:37 AM.