Good you got that rolling again.
It's a 61 cm frame
Centre to top? Are you sure? maybe my eyes are decieving me today, but it doesn't look that
large. Could be, though. Anyhow I can see that you might benefit from a different size. Good luck if you decide to trade the frame- It's a long-shot that there is someone out there with a Special in your size that needs a significantly larger one, but you never know. In a trading situation I would think that reassurance- photgraphic or otherwise- from you that that seatpost is not stuck would ease the transaction. I'm not saying it is
stuck, but when they have been buried that deep in the seat-tube- perhaps for a long time, there is always that suspicion?
Looks like 17" chainstays- the gap between the front tyre and down-tube is smaller than the gap between the rear tyre and the seat-tube. Could be about 1983?