How to identify Blackhawks without internal lock?

[Bitmap]

All of them after some s/n? 

Thanks

[BlkHawk73]

  If new the lock models will have the "L" on the case label and proberly have the black platic grip panels.  Not too darn difficult o remove a grip panel to check.  Not a big deal to me beign as unobtrusive and all that they are.  No different to me than havign a seatbelt in a car and deciding if I want to use it or not.   I'm one to get hung up on the whole "principle" of it. 

[Bitmap]

  If new the lock models will have the "L" on the case label and proberly have the black platic grip panels.  Not too darn difficult o remove a grip panel to check.  Not a big deal to me beign as unobtrusive and all that they are.  No different to me than havign a seatbelt in a car and deciding if I want to use it or not.   I'm one to get hung up on the whole "principle" of it. 

Thanks for the info.

Some people at gun shows object to pulling out a screwdriver and taking their guns apart before you pay for them so it's nice to know how to tell the difference.  If your seatbelt malfunctions your car will still run - I wouldn't call it unobtrusive if your car wouldn't start because the seatbelt retracting spring failed.
 

[warrior1]

just a thought call ruger see what serial number the blackhawks with lock start at.

[BlkHawk73]

  Have yet to hear of ANY issues with the lock design from Ruger.  Remember also, a change of gripframe and hammer strut/spring elimnate the whole thing anyways and it's a very easy swap.