Papyrus Oxyrhynchus 154
Papyrus Oxyrhynchus 154 (P. Oxy. 154 or P. Oxy. I 154) is an account listing various payments, written in Greek and discovered in Oxyrhynchus. The manuscript was written on papyrus in the form of a sheet. The document was written in the late 6th century. Currently it is housed in the Egyptian Museum (10102) in Cairo.
The recto side of this papyrus contains a list of payments of wine, oil, meat, etc., to various people. The verso contains a list of receipts and payments, partly in wheat and partly in money. The accounts on the verso side are of particular interest because of their comparisons between the relative values of different types of solidi. The measurements of the fragment are 300 by 545 mm.
Excerpt from verso side
Given to Andronicus the sailor 70 artabae, and to Anoup and John, lawyers (?) and contractors of the racecourse, as payment for the 11th indiction, 60 artabae of wheat, remainder 482 3⁄4 artabae, 1 choenix of wheat. This, at 1 solidus less 4 carats on the private standard for every 10 artabae, is equivalent to 48 9⁄32 solidi less 193 carats on the private standard, that is, less 289 1⁄2 carats or 12 3⁄48 solidi on the public standard, making 36 7⁄32 pure solidi on the public standard, which are equivalent to 36 15⁄32 solidi on the Alexandrian standard. 
To the banker 12 1⁄8 solidi on the Alexandrian standard, also 1 solidus less 4 carats on the private standard, which is equivalent to 87⁄96 solidus on the standard of Alexandria, total 13 1⁄32 solidi on the Alexandrian standard, leaving 23 7⁄16 solidi on the Alexandrian standard.  
- Oxyrhynchus Papyri
- Papyrus Oxyrhynchus 144
- Papyrus Oxyrhynchus 153
- Papyrus Oxyrhynchus 155
- Papyrus Oxyrhynchus 2024
- P. Oxy. 154 at the Oxyrhynchus Online
- Grenfell, B. P.; A. S. Hunt (1898). Oxyrhynchus Papyri I. London: Egypt Exploration Fund. pp. 234–6.
- According to Grenfell and Hunt, the ratios between the solidi of the three standards (private, public, and Alexandrian) are roughly 161:145:146. The equivalences listed here match these ratios.
- According to Grenfell and Hunt there is probably an error in this calculation. As stated above, a solidus on the private standard was worth 146⁄161 of a solidus on the Alexandrian standard. Here 1 solidus less 4 carats, i.e. 5⁄6 solidus on the private standard is equivalent to 87⁄96 of a solidus on the Alexandrian standard. They note that it is possible although unlikely that there was a large variation in the exchange rate. They think it much more likely, based on evidence from other papyri, that the discrepancy is due to an arithmetic error.