The following Constantine I VOT XX type is unlisted in RIC with a consular bust type (K1) for the plain RP issues.
It is difficult to ascertain whether it should be placed in the First stage or Second stage of the RP issue [RIC 232 or 237]. The two stages reflect the change from VOT V to VOT X for the sons of Constantine (and the disappearance of Licinius), and while Constantine has been allocated coins in both stages by Bruun, the basic type for Constantine I himself did not change from the first to the second stage.
Bruun in RIC proposes a tentative distinction based on decorated wreaths only being introduced later in the second stage, and allocates all the undecorated coins from officina P to stage 1 (RIC 232) and basically all other coins to stage 2 (RIC 237).
However, it is not entirely clear what constitutes decorated and undecorated. Bruun lists 7 different styles of wreath in Constantinian Mint Policy but did not explicitly state there those he deemed to be decorated, cf. undecorated
This coin matches type a) from Mint Policy which is one of the 'simpler' designs listed, implying that it should follow RIC 232. This is supported by the fact that while consular busts for Constantine I are known for the previous VOT XX issue (RIC 227 r5), none of the succeeding VOT issues have anything other than a standard B1 bust listed for Constantine [though Not in RIC lists a B4 bust for the second stage from the Bikić-Do Hoard]. In other words, there was likely a discontinuation of the consular busts very early in the striking of the plain RP issue
However, the second coin attached (RIC 232), with a standard B1 bust has an even simpler wreath, not included in Bruun's list, so if he deemed all 7 of the wreath types illustrated in Mint Policy as decorated, then the first coin with the consular bust would follow RIC 237 if Bruun's distinction based on decoration is followed, and imply that - if the distinction is valid - that there was a pause in the use of consular busts.
My inclination is that the consular bust types likely followed in succession across the two issues of RIC 227 ff. and 232 ff, rather than being introduced in the second stage (237 ff.) but would be interested in what others think!