<span style="font-family: trebuchet ms,geneva; font-size: medium;">Actually, that style packaging -- small red Kirby circles all over -- was used for the 518 through the 560. The 561 packaging had the same pattern, however, the background color was turquoise. But the fact that the collar on the hose is red plastic does indeed narrow it down to a 560. Until then, the collar was unpainted metal.</span>
<span style="font-family: trebuchet ms,geneva; font-size: medium;">When I get home I can post some photos of some of the various Kirby cartons if anyone's interested.</span>