Holton 105 Tuba Value -- Help!

I apologize for the account name, I did not make it! But- I have a Holton 105 tuba, serial number 323214. 3 valve, bell-front, 5/4 (not 100% sure on this, all I know is the thing is massive!) size. It is in good condition, obviously some dents and missing lacquer, but for being 60 (?) years old pretty good! Just took it to the shop and they fixed all the brackets and similar problems, but they could not give a good estimate on resale cost. I realize that the value is probably pretty low, but I thought I would post this to see if there is anything I'm missing. I looked all around the internet and could not find anything similar. Thanks for any help you an provide!