Morgan Library W.29 is a small, pretty book of hours from somewhere in northern Italy, perhaps Ferrara, as per the catalogue.  The calendar is not very well done, there are only about 120 days populated, and the scribe did not use the ruling from the date info columns, the left with the dominical letters and the roman dates, when writing in the saints, so they do not align directly with the dates.  This amplifies the large number that have ended up on the wrong date, for example the entire second 1/2 of July is offset by one day.  There are also a few spurious entries, for example a "Vigilia" floating above the "Circucisio dni" entry on Jan 1.

(DB ID: 110)

BPL MS q.med 131 (not available in their online catalogue), is a tiny (largest dimension is <4"), early (1320-1330) book of hours, Fransiscan Use, from Camerino, Italy.  Despite the small size, the calendar is clear and readable where the ink is preserved.  In addition to the feasts, there are notations of the signs of the zodiac in the calendar along with some liturgical notations, for example the earliest and latest dates for easter, and even the equinoctes and solstii.  For an early calendar, the date range is unusually narrow due to notation in a later second hand, which has added some saints through the yeat, of the date 1338 at the end of April (see f.4v below).  The 190 saints are irregularly spaced through the year, for example none in April before the 14th(see f.4r below), and the calendar is imperfect, there is no line for the 18 Kalends of October (Sept. 14). 

(DB ID: 147)

Harvard's Houghton Library MS Typ 553 is a weird Use of Rome Book from the late 15th century, only localized to "Northern Italy".  The calendar is unevenly populated, 5 saints in March compared to 20 in January, and has a very large proportion of "high" importance (red) names, more even then normal rank saints. In addition to the usual saints, there are also most of the zodiac signs indicated as well as some here to for yet unidentified liturgical indications(see line 12 in May, f3r below).  The scribal work is also unusual, there is no horizontal ruling at all, so the saints are often not alligned with the date information.  

This is a weird little book about which little is presented in the catalog, there's no Use, and source is just listed as "16th Century, Italy".  The calendar is not well populated, with only 169 total saints.  Later in its existance it was in England and 38 more saints, mostly particularly British saints, were added.  On f.6v, the second page of June, below you can see St. Botoulph and St. Alban, etc.