Fair price for a non-SN swiss E movt?

[bazonkers]

I'm swapping out my non-swan neck swiss movement from a 172 to put in a proper swan neck as per the gen. The person doing the work has offered to buy the movement but I need to come up with a fair price.

I have no idea what is fair. What do you guys think is fair for an E bridged non-SN swiss movement?

[ravishingrick]

Have no idea what a fair swap would be but be aware that you will be swapping a genuine Swiss ETA for a Asian 6497 copy movement, esthetically the Asian copy is closer to gen, but the "base" undecorated Asia copy movement is a dirt cheap movement. The Swiss ETA 6497's are getting quite difficult if not impossible to source.