values. Well that's my thing, but I am flying in the dark a bit....
45year old watch=1969.
OP led me to believe original caseback was smooth, so let's assume we are starting with a tired, possibly very tired 145.022-69. Calibre 861.
Head only, and assuming all original and complete at that time, then base value is about USD$1800 before adding in the "barn find " premium which could take it to as much as $2500. If the dial was truly awful, unusable, then I would reduce by 300/500. If the dial has aged gracefully and shows attractive patina then the watch was worth much, much more. There is a brown dial in the market now for $3000 - just the dial.
The thing is that the market values original untouched one owner watches far higher than their components.
The opposite is true for assembled watches, the market values them less than the sum of their parts.
So an 861 cal speedmaster made from NOS parts sells for around $1500/1800 the last time I saw Watchco do it in auction (BIN prices much higher at around 3000 from memory). They tend to get premiums, and so I guess that this watch might be bid to $1400.
to sum up:
assuming a 145.022-69 with usable but not special dial, barn find condition, head only, returned from Omega with new hands, dial, bezel and case back.
Original watch $2500
serviced watch. $1500
service costs. $1100
forget the money.
Omega destroyed the watch.
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