The SN you give puts it past the antique SN aka the gun is post 1898 manufacture since the cutoff is 382022 for your model. This means that it should be transferred if required.

I also think despite the gun not being an antique (usually means a premium) that the value you got is low. Your gun looks nice and if it functions well, I would say its worth $200 to $300.
I know I'd buy yours instantly at $165 because its nice overall.