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Any version number lower than 13.0 was saved under the old DUCS archive system. Under this old system, all versions, major and minor, were actually full DUCS copies. Thus, for example, versions 11.5 and 12.1 are actually full versions. They do not require any corresponding major versions 11.0 or 12.0. Indeed, the old system has no versions with minor version number zero.
The ducs version command handles these old versions seamlessly for the user. It assumes that any version before 13.0 is from the old system.
Restoring very old versions must be done using the older system outlined in the documents The Practical Guide to Version Management and VERS_MAN: Tracking Code Version Releases. To simplify the transition, the four versions from just before the new system came on line, versions 11.5, 11.6, 12.1 and 12.2 have been stored to tape under both systems. They can therefore be restored using the new system.