I think we have wandered away from the OP.
Buying a vintage speedmaster is always about compromise and desired use. As an investment, this watch is never going to keep up with the higher prices achieved by the fine condition ones. As a usable piece this is something I like. The overall look is pleasing and a service will solve many issues.
The corrosion is an issue, however I strongly feel this is reflected in the price. I consider the "median" (May not be the right word) price for a 105.003 at around $5500. If they are cheaper there is one or more issues influencing the price. If they are more, then condition or overall look is better than most.
I don't know of a better straight lug speedmaster on the market for less than $3500.
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