The pictures below are my scans in five parts of an early Japanese Transformers: Return of Convoy / Battlestars catalog. To zoom into a part, I would recommend right-clicking on it and opening it in a new window, but be prepared to wait, since the zoomed part is four times the size seen here. Descriptions of the pictures can be found at the bottom of this page.
This is the front side:
This is the back side:
The top half is the cover, with a battle scene involving Star Convoy (with his previous form as Convoy changing into it) and other characters of the Battlestars series.
Included are a whole slew of Micromasters; one, Hot Rodimus (Hot Rod), is to the right and below him. Another next to Hot Rodimus is Shotbomber, the one with a pair of orange missiles on his back. To the direct left of Star Convoy is Grandus in battlestation mode. Sky Garry is just farther left, changing from flying transport carrier (seen dropping a stack of three white and orange Micromaster trailers) to robot mode.
Below Sky Garry are six trains which combine into Sixliner at the bottom left of the battle scene. Above Sky Garry are five Aerialbot planes which combine into Superion, half obscured by the series logo. Flying into the series logo with only its tail section showing is the Big Powered superjet, a combined form of Dai Atlas, Sonic Bomber, and Roadfire from the preceding Transformers: Zone series.
The bottom half gives the background behind Convoy (Optimus Prime). Behind him is the battle scene from the back of American boxes of the original Transformers.
Middle part of front side
The names are as follows, corresponding to their identification numbers:
Three big Transformers:
Nine Micromaster teams (each team comes with a Micro Trailer):
Right part of front side
This contains Star Convoy, whose identification number is C-372, in various modes along with Hot Rodimus. This is probably just a prototype since his white pelvis plate is changed to black in the released version, and the dark gray of his vehicle mode is changed to white.
Left part of back side
There is no obvious place along which to divide this picture into smaller parts, so I divided it like this.
Along the top left are Star Convoy and Grandus in their base modes, with Micromasters all around them. The right shows that Hot Rodimus can be placed inside Star Convoy's chest. The bottom shows the linking of Star Convoy and Grandus with Sky Garry on top of Grandus to form a giant rolling vehicle called Battlestars.
Right part of back side
The top contains a story with the Cybertrons Star Convoy, Grandus, Sky Garry, and Sixliner fighting Dark Nova and his various forms of Megatron. Dark Nova is the dark-blue and grey spherical object with orange tentacles. The bottom contains a mail-order offer for the Aerialbots, who can also be seen on the catalog's cover above.