Orthoplan Serial Numbers
Orthoplan Serial Numbers
Anyone know of a site or reference I can use to determine when an Orthoplan was built based on its serial number?
Re: Orthoplan Serial Numbers
Hi,
This file is J. Gregory McHones work. It lacks data on the last 10-15 years but is good as a rough guide up to 1977. Even after that, if we knew the total production number, could deduct the year of manufacture with relative accuracy.
This file is J. Gregory McHones work. It lacks data on the last 10-15 years but is good as a rough guide up to 1977. Even after that, if we knew the total production number, could deduct the year of manufacture with relative accuracy.