1961 Seiko Crown J14065 19J

All this talk of Seiko's has got me wondering. Here is one for sale by a local collector that looks interesting. Anyone here knowledgeable enough to comment?

My concerns are that:

There is no picture of the movement. In fact I have not seen the movement for any Seiko ad. Is that common? Perhaps they are front loading?
If there is a problem, then from what I understanding, servicing something this old is nearly impossible, parts wise.

Any vintage Seiko experts here on OF?

They are asking USD $335.

I’d be careful about buying a vintage Seiko without a movement pic. I would hazard to guess parts availablity is an issue. FYI, here is a sold example with a movement picture, Good luck with the hunt.

http://antiquewatchat.blogspot.com/2015/02/seiko-crown-diashock-21-jewels-07.html