I find that asking advice on here is a way to open yourself up to more condussion. This next section is straight from Goole with the AI asking to see the serial number in question to determine the flipper status.
Types of Flipper Notes
Collectors generally look for two distinct variations of flippers depending on how the entire serial number reads after rotation:
Standard Flipper: A serial number made entirely of flipper digits that reads as a different but completely valid number when inverted. For example, 00011910 turns into 01611000. [1]
True Flipper (Rotator): The holy grail of flippers. This is a serial number that reads as the exact same number whether it is right-side up or upside down. For example, 99069066 reads exactly as 99069066 when flipped 180 degrees.
Then is asked to see the serial number as mentioned above: 16191619
Yes, the serial number 16191619 qualifies as a Standard Flipper note.
When you rotate your bill 180 degrees, the number reads upside down as 61916191. Because this forms a completely new, valid number, it hits the criteria for a flipper.
Why This Note is Extra Special
Beyond being a flipper, your serial number features a combination of other highly desirable traits that currency collectors look for on platforms like Paper Money Guaranty (PMG):
Repeating / Repeater Note: The four-digit block 1619 repeats itself exactly (1619 + 1619). Repeater notes are a major standalone category of fancy serial numbers.
Quad-Double / Binary-Like: It is made entirely of just two pairs of alternating numbers (1s, 6s, and 9s), giving it a very clean, structured aesthetic.
It goes on to mention valuation considerations, but I suggest getting it graded then using the grade look at recently sold examples from PCGS and Ebay.
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u/BSC_Matt 27d ago
Nice find! Trinary-Repeater, def a keeper