Can anyone identify this seiko?

Hey guys my friend jut received a seiko from a grandpa an will like to have it identified. Anyone can help? It's from 1973 I think and some anniversary model or something.

bell matic alarm.....4006-6031



not anniversary or anything...



anyway nice piece , i got 2 of them

very nice mint cond bellmatic :!: :!:



this is a nice size as well, it's a piece to treasure!

wtf bbq i cant seem to post .. testing testing

yea, my friend's grandpa took care of it pretty well. thanks for the assist guys.