Yet another William Vrelant manuscript held at the Walters Art Museum, W.184 is a late 15th C book from Bruges. The calendar is not very decorated, but there's a bit of gold leaf on the KL at least. In the calendar there are only 120 days populated, and of those the regular 1/3 are ranked high. The saints listed are a smattering of the usual Belgian ones, though there are a few unusual ones. One that stands out is St. Cornelius (March 31, see f.5v below), which only appears in one other book, the Huth Hours (BL MS Add 38126)

(DB Id: 204)

Continuing to add from the Walters Art Museum, W.183 is a late 15th C book from Bruges. The manuscript was illuminated in the circle of William Vrelant, as were Walters W.168, W.177, W.179, and W.180. The calendar is very sparse, both in terms of decoration and population. There is no border, Zodiac or labor of the month, only the bare minimum of KL at the start of the month. After the Calendar, there are lovely borders, with berries and birds, at the start of sections of the text and a profusion of full-page miniatures.
The calendar itself is rather common, about 50% full (155 saints) and of those about 1/3 high-importance feasts. There are a fair number of errors, even some of the important feasts, such as the Sunday of the Resurrection(should be March 27) or the Pope Leo the Great(should be April 11), have shifted by a day or two. I'd expect this is either scribal error in this MS, due to the low population of saints it's harder to keep registration, or an error in the source. Hopefully a larger DB of similar manuscripts will narrow the root cause.

(DB Id: 203)