This is a VERY generous offer and also will give the most realistic value for the lot. I would take up this offer form skyline. If you dont do this I would try to go to a local pawn shop with her and the tools and find out what they would pay for the collection. That would also be a fair market wholesale value.
I also want to wish you good luck. Been there done that. Walked away with nothing but a wrecked credit score and all her debt!!
I will be taking Skyline up on his offer, I really don't have that many tools and really most were bought when I was apprenticing where Mac and Snap On were offering discounts on their tools to apprentices.
Lucky for me my credit score is better than when I got married and our debt is all joint tied into the house. I should be okay in that department.
Divorce sounds like a real PITA, maybe you should learn to get along with each other?
1) Take a full set of photos and establish a baseline of what you have.
2) What Olafur said, she thinks you spent $100k on tools, correct that with easy to produce facts like list prices of tools and you may be most of the way to sorting this out.
It is a pain in the ***, but I see the light at the end of the tunnel. Not to bore you guys with specifics and I don't want to talk about it online but just to give you an idea. She is on the far left of the negative scale and I am on the far right of the positive scale

Needless to say this was a long thought out process and it wasn't made over a cup of coffee.
You know I always thought about keeping all the receipts from my tool purchases but I never did, not even contemplating this would happen.
F that B...cherry pick the tools, take them to a buddy's house and let her lawyer find them...or better yet...they were stolen...or put a bunch of harbor freight garbage in the box. What total ****...i would not play this straight if i were you! Its not what they know...its what they can prove.
On a side note...best of luck to you my friend. Im sure this is tough to go through...keep your head up and your toes tapping...things will work out in the end.
Trust me I have thought about that but you know she is being fairly reasonable and not causing me a ton of grief. Last thing I want to do is hide **** from her only to have it come back to bite me in the *** later on. I'm finding in this process lay all your cards on the table and work it out. As for keeping my head up and toes tapping........... every day is a bright beautiful day.
Even though this tread has the description " How to calculate market value for Snap On Tools?" and many contributors have put forth valuable insight regarding that - what I bold in your reply is the main issue for him/them. Well put Danglerb.
Additionally I want to repeat that she has already offered her opinion on resale value of used (SO) tools; In other words: 25%
What did you really spend on these, and how much was new when purchased? If it is in fact 100k for new tools, i'd say 25k is fair.
Your right guys if I had spent 100K I would say 25K would be a little low in my opinion, 30K-35K would be what I would expect out of 100K. But you'll never find someone to purchase a set of tools at that price so you either split the collection or take a hit dropping it to 25K both would be a pain in the ***.
If it was fun everyone would be doing it
I wouldn't be doing it but I still have a lot of good years left in me and I want to have fun and enjoy life.
Thanks again for all your replies.