It is common, but not universal, for the opening line of a letter to project further to the left than the first line of the main message (line 3) which, in turn, is often set further to the left than the lines following. The loss at the left is therefore uncertain but we should probably allow for at least 13 or 14 letters, including the traces, for the name of the sender, which no doubt included both gentilicium and cognomen. For Lucius as a cognomen see RMR 82.3, 184.ii.21 and note and cf. 156.2 note.
There appear to be two names, which is appropriate to what follows (cf. 295.i.3). The first may have lost one or two letters at the left. The second name, Frontinus, does not occur elsewhere in the tablets.
Numerals are sometimes preceded and followed by medial points (e.g. 295.i.4), a common phenomenon in later manuscripts, but in this case there is only one following.
The reading is very uncertain. If it is correct, the author may be referring to sending back some other colleagues (collegas).
The traces are very abraded and obscured by dirt.
qui looks certain (but note that the form of q is quite different from that in line 4, cf. Fig.1 (p.53, above), cols. 1 and 2). After that we could read ita although t is not easy.
The reading may be simply scripsi.
It is noteworthy that the scribe has written the substantive closing greeting, leaving the author to add only uale in his own hand (cf. 250.ii.17, 353.ii.3).
uale is written in a quick scrawl; u is practically a flat dash; l has hardly any vertical; for the form of e see Fig.1 (p.53), col.3.
It is difficult to read anything except u in the name. At the right we may have d followed either by an abbreviation mark or by ec (cf. 299.back).