Old condenser seer?

[jdm2447]

Could anyone tell me what the seer would have been on this old condensor Intertherm RACZB-030KAWC approx year 1987

[coolguysfl]

P/ Carrier blue book = 10.00 SEER nominal 31,000 BTU Exact BTU / SEER will vary on line set size / coil match.