Warn hubs or something else

I have a 74 Blazer with aftermarket locking hubs. The hubs have either a "WW" or a "MM" on them and the center is brass colored. Are
these Warn hubs or something else? The right hub won't lock in so no 4x4 which is bad in this part of Montana. Anyone have any
suggestions or can help? The Warn factory site doesn't show this style but the locking hubs were installed back in 1995 or so. Thanks.

Can you get th locking mech off? The road salt/sand wreaks havoc on those.

Warn and Superwinch make replacements. Warn has neat product called a hub fuse. They claim it'll break before a u joint does. Great idea if you install spool or locker.