Hi Mike,

Thank you for contacting Mearto with your appraisal inquiry.
You may be correct about the rarity of this font; I found a similar example having been sold for $700 in 2021 at an auction in Florida, but that was from the collection of a famous and discerning Hummel collector which may have helped boost the price a bit. https://www.liveauctioneers.com/item/95317697_rare-hummel-holy-water-font-77-tmk1
Based on the photos and information provided, and subject to examination, this is:

A vintage Hummel Holy Water Font
with cross and doves
Modeled by Reinhold Unger in 1937. TMK-1, Hum 77.
Made as samples only; only 10 known examples in existence per Miller 7th edition.
6 1/2 inches high by 2 3/4 inches wide
CONDITION: appears to be in good condition
PROVENANCE: acquired at a garage sale
$500-700*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.