taw1126,
I have been watching the Type C at Simpson's for quite some time, frankly because it has been the only Type C available for sale (at least the only one I have come across in the past 4 years- and I comb through the dealer sites like one with a heavy stock portfolio combs through the Wall Street Journal). The complex and diverse nature of Mauser's contracts are surely to blame in answering your question. I suppose that a special run of Type Cs were attached to the military contract under the auspices of "meat for the pot" and intended for the quartermasters of the Argentine Army. In reviewing Speed's information on page 111 I noted that the rifle's action was originally made for the Turkish contract (under Mauser and when Mauser could not fulfill the 500 a day quota on the contract DWM stepped in) and chambered in the 7.65x53mm Argentine cartridge. DWM was in fact Mauser's parent company and the take over haunted Herr Mauser to the very end- see "Snake in the Grass" page 29 of Speed's book. I must say were it me I would most definitely lean toward this Type C over the Model B you have as choices. You are quite correct on the rarity standpoint and subsequent higher cost of the Type C, surely it is not as refined as the Model B but you would possess a very rare piece and one featured in the best Mauser Sporting Rifle volume to date. I only wish I were in your dilema!! Best regards.