that cal. 3000 uses a balance cock while the cal. 3130 uses a balance bridge. No-date Submariner Ref. 14060 was powered by the cal. 3000. When the reference was updated to ref. 14060M the movement was changed to the cal. 3130.
Plus, you say it's a 14060 not a 14060M. Definitely a cal. 3000.