Date widths are for the truly dedicated completionists, I personally don't get much excitement from them. Like you say, for the Victorian pennies there are many, many date widths for many, many years.. High/low/wide digits, thin/thick digits, digits with/without/extended tails, open/closed/recut digits, the list goes on. I do subscribe to the already widely recognised examples like the open 3 but not much else - although I have some examples of different spacing dates, they're not part of my main collection.