Prooflike Surfaces on Seated Halves - Uncommon?

I own an 1849 seated half that has a reverse that has mirrored surfaces amongst deep purple toning. I've posted this before, but it is a joy so to see in hand and the great pics don't show the flashy mirrored reverse. From CRO:

I'm curious to hear from others whether PL surfaces are unusual with seated halves or are seen fairly often. What has been your experience? Also, if you have a PL seated half, post a pic.

I'm curious to hear from others whether PL surfaces are unusual with seated halves or are seen fairly often. What has been your experience? Also, if you have a PL seated half, post a pic.
Seated Half Society member #38
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but from what i've seen...it can be hard to try to cherry pick a proof from ms
many have stunning fields...devices can be razor sharp too with even frosted looks
i'd think yes
very common
but those in this niche will chime in surely
The semi-PL is not unusual for this year.