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| official count | PSS type | footnote(s) | price | authorization | Comment: Hoover-Noble Universal style numbers; PSS Town and Type catalog, 6th edition, is current basic reference |
|---|---|---|---|---|---|
| [ ] | 841 | 4 | 15 | Jan, 1974 and Jun, 1983 | U141nc, added 2nd ed, 1 or 2 devices? d8.5 |
| 841 | 4, var | 15 | 6th ed added footnote 4, d8 | ||
| 841 | 4, var | 15 | d9 | ||
| 841 | 4, var | 15 | d10 |
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