Waffen Bultmann, Gemmingergasse 5, D74072 Heilbronn, is a simple local gunshop. Sorry, but I do not have an email address. They certainly did not make your scope, but merely retailed it.
That ad as “a WW2 Germany Wabu Waffen Bultmann Heilbronn 4x36 81 Scope” is pure bs as the scope is obviously postwar, about 1960s. To me it looks like an early Schmidt & Bender. Founded in 1957, S&B made scopes for the trade exclusively until 1970, see https://www.schmidtundbender.de/en/company/history.html Those scopes were not marked with the S&B logo, but with various trademarks or house brands of wholesalers or retailers. That special reticle is either experimental or special order. I had not yet seen such a form.