Great Britain 1929 PUC GBP 1 'Postal Union Congress'
- Maker
- United Kingdom
- Year
- 1929
- Rank
- 85 of 100
- Identifier
- SG 438, GBP 1 black (KGV), Postal Union Congress; mint; ~61,000 printed
Great Britain 1929 PUC GBP 1 'Postal Union Congress'
Price-guide value, not a sale: $1,400, dated 2026-01-01. This is not a sale. It is what the market was asking, and no transaction is recorded behind it.
What is it, and why is it in the FLOAT 100?
Britain's iconic high-value commemorative — the must-have keystone of 20th-century GB collecting.
SG 438, GBP 1 black (KGV), Postal Union Congress; mint; ~61,000 printed
What is the best-sourced number for it?
- Figure
- $1,400
- Kind
- Price-guide value, not a sale
- Date
- 2026-01-01
A price-guide value is an editorial estimate, not a transaction. Guides lag the market and smooth over grade and condition. It is useful as a floor for how the trade thought about the object, and it should be checked against a realized sale before anything rests on it.
By reference price, Great Britain 1929 PUC GBP 1 'Postal Union Congress' is number 82 of 99 in the stamps entries of the FLOAT 100. 75 of those 99 rest on a realized sale; the rest carry an asking price or a guide value, and each page says which. Rank within the FLOAT 100 itself (85 here) is editorial: how much an object defines its field, not price alone.
How this is made
- The figure
- One reference price, shown with its own kind. FLOAT does not average it with anything or adjust it for time.
- Realized or not
- A realized price is a completed sale. A market asking price and a price-guide value are not sales, and are labeled as such wherever they appear.
- Why no grade ladder
- Most FLOAT 100 entries are individual objects. There is one of this, so there is no population and no spread across grades to show.
- Archive
- 2026-08-08
Track your own
FLOAT is a free tracker. Add the stamps you own, keep photos and certificates with each item, and see a value built from real sales at your item's grade. This page is a public reference; it does not offer, price or sell insurance.