Service card vs original papers vs. CPO

[cascadez71]

1. Would you value service papers (still valid for 18 months) essentially equal value to original papers/card when buying preowned?

I feel they must be rather similar in 'value', both presumably demonstrate provenance. I suspect selling you will get less for service papers than original, but difference is marginal?

2. What is the CPO value worth to you when buying used? Cost of one service?

And yes, I am only comparing between trusted sellers and CPO. Looks like "non trusted sellers" aka. reddit/watchexchange sellers with >1 year history and >50 feedback will save maybe 7-10% on a steel professional model vs. trusteds.