$375 for my area is very high. Your area may be different. Honestly, just before Christmas is usually the wrong time to buy a featherweight. In my area, I have a hard time selling a fully serviced, exceptionally clean black machine for $250. I will sit on it for months, as in sometimes 6 or more. I paid less than the asking price you stated for my 222.
Yes, a tan or a celery (White) machine is rarer (more rare?) than a black 221, so it can command a little more money, BUT - if you want to resell the machine down the road - you should not pay this much money for it.
That said, if you plan to keep it, and it's clean, and you have that money available, then go for it. We always tend to overpay for our first few machines, and at the end of the day, it doesn't matter if it's a keeper. I paid $145 for a 1913 27 treadle. I've put about $150 into her to make her whole - her wood was rough and there were pieces missing, no shuttle, no slide plate, etc, and she still has wood work to do. Betty will be part of my estate though, so it doesn't matter.
When I found her, I actually called DH and asked: What would you think if I paid $145 for something that was broken?