Seco 1x1x6" Lathe Grooving Tool Holder CFMR 100 06D LCMF 160604 Carbide Insert
I believe these take any LCxx 1606xx carbide inserts, such as LCMF LCGA LCMR LCGN 160604 160608 etc.
Please take a look at all pictures to judge the condition for yourself.