I have an opportunity to buy a No4 micrometer rear sight. Problem is I’m not sure if the price is fair since the last time I bought one was 5 years ago for around $75. I tried looking a round to get an idea but all the advertised No4 micrometer sights I can find turn out really be No5 sights. The one I’m looking at is for a proper No4. Anyone know what these are going for now?

Thanks in advance.
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