I think you will find the base model monos did not have the number board on. I know because I bought one new in 2004
The mono’s had an aluminium sub frame that was prone to busting under vibration. The bipost’s had a steel subframe as they were liable to higher loads. A lot of owners with a mono would end up fitting and modifying a steel subframe from a bipost. I had a 999S (mono) and the subframe bust and was replaced under warranty. I was advised to source a steel replacement as the aluminium mono subframes were wank. It got nicked shortly afterwards so here endeth the story *Note- later model S and R (2005/6) had a modified, stronger aluminium subframe fitted I think….
2006 999s and I am currently on the third aluminium sub-frame. I've two now heavily modified and strengthened. Ginger Hall to Ramsey broke one of them; it's a bumpy stretch !!! So if that's the strong one then early ones were cheese.
I Have a 2006 model base 999 mono, the V5 says Bip. I emailed Ducati Italy they wanted proof of ownership/engine/frame number and confirmed it left the factory as a Mono.
