Inscription: (.1) stamped on bottom: 753
incised on bottom: No 753
engraved on bottom: (see cards)
(.2) stamped on bottom: 749
incised on bottom: No 749
engraved on bottom: (see cards)
Marking: [1] ZD in rectangle (maker's mark of Zacharias Deichman the Elder, w. 1731-76);
[2] IF (in cyrillic letters) in rectangle (assayer's mark of Ivan Frolov, 1738-79);
[3] kedge and anchor in saltire, 1766 below (St. Petersburg town mark)
[4] 7 and 9 (standard mark)
Location of marks:
All on both coolers, .2 also marked with double zigzag assay line
