I'd like to contribute some images of a red bull I own to add to the discussion. I acquired it about five years ago along with an ashtray during the same visit to an antique store.
I know you stated above that you don't believe red Bitossi bulls exist, so forgive me for bringing up this topic again. A few notes about my bull:
*The overall shape seems to be consistent with Londi (as another member noted, the girth is much wider than the Jema bulls)
*The impressions are much deeper and cleaner than the original photos above
*I have not weighed the piece, but it feels fairly heavy
*The color of the exposed clay on the underside of the feet seems to be consistent with original pieces
*The mark is handwritten and appears to include a "B" without any period or underscore (perhaps a very faint period is present, but I can't tell)
*The mark seems to read "Cer-B Italy" but the second and third letters are difficult to distinguish (maybe "Crn")
I think the bull is absolutely stunning so real or fake, I love it. I'm just curious to know more about it. Also, any comments on the ashtray are also appreciated.
Thanks for any insight you can provide. Let me know if I can provide any additional images or information. I'm new to the site, so I'm not sure what the quality of the photo uploads are - let me know if you need larger images. Also, the photos probably indicate that the bull needs to be cleaned (dust and grime).