I have a 4 screw Model Marked K-32 & a 5 screw Non Model Marked K-32 and I would be interested in trading them for a 6" & 8-3/8" M-16-4 but am unsure of the value placed on the M16-4s these days. I haven't seen a M-16-4 in years nor have I seen the earlier K-32s priced for sale either. Is there anyone in this group who would be able to suggest how a trade could be completed and which has the higher value considering that all are in good mechanical & appearance condition?