3 different backs were made for the SL66 camera

1. This Rolleiflex SL66 Polaroid back is great for macro, studio and more. This is the gorgeous all metal back adapted by ArcaSwiss in Switzerland. Takes all Polaroid Films 107, 108, 665, 667, 668, 669 and similar.
This is a sturdy made metal back, great quality. Looks expensive and feels like a Mercedes.

Item # 977 140
Made from 2/1971 - 2/1983
2. Arca Swiss Polaroid back new version in 1983.

Item # 530 316
Built from 3/1983 - 9/1984
2. Arca Swiss Polaroid back new version in 1983, seen from the back.

3. A completely redesigned back followed later in 1984.

It came with the option of exposing two 4,5x6 cm pictures on one single sheet and -more important- included ASA settings to couple to the meter of the SL66E and SE/ X cameras.

Back came first with two ASA settings: 75 and 3000, but later versions had three ASA settings: 75, 100 and 3000.

Item # 560 320
Built from 10/1984 - 1995
3. The latest version for SL66 X, E and SE cameras had 3 ASA settings. Click picture for more details.