Letter written on 26 Nov 1970
Osho wrote many letters to Ma Kusum Bharti and her husband Kapil, then of Ludhiana. Most were addressed to Kusum, but always mentioning Kapil too. 27 were published in Prem Ke Swar (प्रेम के स्वर). Sannyas Wiki has images of all but one of those published in PKS, plus three unpublished ones.
This letter is dated 26th November 1970 and was published in Prem Ke Swar (प्रेम के स्वर) as letter #22. The letterhead appears to be a typical one from the short-lived Churchgate period, with the addition of a second, hand-written phone number.
See also Letters to Kusum and Kapil