The number before the colon, 0048, is the Punjab University Library's accession number for the manuscript. The number to the right of the colon, 656, is the catalogue serial number from the published library catalogues of 1932 and 1941.
The accession numbers are clickable links that take you to the full information for that manuscript.
An inversion of this browse, with the list sorted according to catalogue number, is given by clicking on the next navigation item "Catalogue Number" in the menu box to the left.
This browse returns 278 accession numbers having 278 different catalogue numbers: