Cheap”ish” service overhaul for old Seiko?

Hey everyone. I bought a really nice looking Seiko Actus Automatic, but I’m afraid it’s due time for a full service. is it worth it fo a cheap watch? how much would it normally go for?

I got this for 15000 yen and it is working at the moment, time keeping doesn't seem off nor its power reserve. however I took it in to get a new pin on the bracelet and they suggested getting a full service (I imagine to lube up the mechanism etc), I would like to get the crystal changed as it has some scratches and dust.

looking in the Ueno area if possible?

by Brice_Tea