Hello Numista Community,
I hope everyone is doing well. I am opening this discussion to seek clarification and collective insight regarding the use of X-prefix and 1/X-style prefixes in several Pakistani banknote denominations. I have been researching this topic and also discussing it with another Numista referee, who advised me to post here so that Pakistani collectors and experts can share their knowledge.
Below are some key observations that I (and others) have noticed:
Gradual Serial Number Progression
When examining X-prefix notes across different years, the serial numbers increase slowly and steadily, rather than jumping in large blocks. This pattern is typical for replacement notes, which are printed in small batches to replace spoiled sheets.
Alphabetical Prefix Logic in Pakistan
Pakistan normally follows an alphabetical prefix sequence for circulation notes:
A → B → C → D → …
After single letters, it continues with double-letter prefixes like AA, AB, AC, and so on.
However, X does not appear anywhere in the normal alphabetical progression of many series.
Consistent Use of X Across Many Years
In the Rs.10 and Rs.20 , the X-prefix first appears in 2006 and continues all the way to the final years of the series without progressing forward strongly suggesting that X is reserved for replacement printing.
Letters Avoided in Pakistani Printing
Pakistan’s printing authority avoids letters that resemble digits:
I (resembles 1)
O (resembles 0)
Because of these restrictions, X does not appear in regular circulation prefixes, so its repeated presence is unusual unless it is for replacement purposes.
This Pattern Exists in Other Denominations Too
The same behavior is seen not only in the modern Rs.10 and Rs.20, but also in older series:
Old Rs.5 “Gwadar” note – X-prefix examples exist and show the same slow serial progression typical of replacements.
Old Rs.5 note also appears with X-prefix, again showing replacement-style behavior.
Other earlier Pakistani notes with fraction-style prefixes also follow similar patterns, suggesting that the concept of special replacement prefixes existed long before the modern series.
These observations across multiple denominations strengthen the idea that Pakistan has historically used special, non-sequential prefixes—such as X or 1/X-style fractions specifically for replacement sheets.
I am attaching several images from my collection for reference.
I kindly request input from Pakistani collectors, researchers, or anyone knowledgeable about these prefixes. If there are official references, catalog sources, or personal research findings, your contributions will be highly appreciated.
The referee also suggested that I create this post so that Pakistani specialists can share their opinions — so here it is.
Thank you all for your time and assistance.
Regards,
Hammad
