Recently I sent a 110 I purchased in 1973 back to the Buck "spa" to have it cleaned and sharpened. I had carried this 110 when hicking, canoeing, camping, white water rafting, salt water sailing, etc. and it had accumulated quite a greenish "patina" after 30+ years. Well needless to say the spa made it look brand new and I was wondering if anyone knows what the "spa" uses for polish. Sorry I did not think to take before and after pics as the difference was amazing.