As far as I know, mine would be a GE 25w "Mazda" clear incandescent.  Seen here:  http://www.lighting-gallery.net/gallery/displayimage.php?album=2337&pos=13&pid=84716

As far as I know, my oldest linear fluorescent would be this:  http://www.lighting-gallery.net/gallery/displayimage.php?album=2624&pos=31&pid=80066

Lemme see here...
MV: Ken-Rad and ITT 250w /C and /W respectively. 1965
Incan: westy (Kmart). Mid 70s
HPS: Norelco 35w from 80s
Fluoro: ge f20t12/d from 1954
MH: 250w ushio from the 00s
MV ballast: GE 175w 240v and GE potted 100w 120v from early 60s
HPS ballast: Postline from late 90s or early 00s
Fluoro ballast: several f20 chokes from the 70
MH ballast: advance from the 70s or 80s
Hid fixture: LM gumball from 40s or 50s.
Fluoro Fixture: crome f14 Art Deco strips from 40s or 50s
Incan fixture: twin table lamps from 30s

hello, 
I wonder if anyone can advise me on what I have.. its a room heater with 2 Cryselco bulbs (105v 250w) with numbers 6027 on them and 2 roberstson no 8s (105v 250w).  I havnt been aboe to find anything else like it online..

err, I don't know to be honest but i have a lot of bulbs I mostly scavenge them

One of these may be the oldest of mine. Does anyone know when approximately it was made? I'm not sure if the Westinghouse or the Laco is older.
http://www.lighting-gallery.net/gallery/displayimage.php?pid=112766&fullsize=1

http://www.lighting-gallery.net/gallery/displayimage.php?pid=107750&fullsize=1

My oldest lamps:
http://www.lighting-gallery.net/gallery/displayimage.php?pid=128763&fullsize=1

I'll add in more 1930s GE type D in colored versions as well especially after an recent eBay score that included several orange ones just over a month ago.

I have a 1990 GE 175 watt Mercury and a 1988 Philips 250w Comfort lamp.  Other than that, most of my lamps are from recent times.  I used to have some older lamps, but when I moved to Wisconsin, they disappeared somehow when my parents moved and packed up what I left behind.  They may be in my shed buried underneath a bunch of junk.

I have a West German GE inside frost A19 incandescent.  It had to have been made during or before 1989 when the Berlin Wall split Germany.  It's a great bulb, in my permanent collection.  Here I am at the Berlin Wall on my trip to Germany last year.

Oldest:
Philips 40W outside-frosted flame (Sep 1981)


Some other oldies in my collection:
Sylvania Sylvalux 40W soft white (~1983)


Thorn 20W T12 white (Aug 1988)


Sylvania F20W/W-RS (Sep 1988)


Osram HQL 50W (Nov 1988)


Sylvania F20W/133-RS (Nov 1989)

my oldest incandescent: a pair of sylvania 300w ps-30 mogul based on the logo are 1942-1959 oldest merc is a 250w BT-28 H-250-j5 date code 29? color improved lamp from mid ro late 50's? oldest streetlight is either my form 400 or  the revere clamshell that the 250 is from

One of these:

One of these:

You lucky man.!!

I'm not altogether sure, I don't have much really old stuff, possibly this carbon filament lamp dates from the 1940's, but I'm not sure. There is nothing on the etch that suggests a date code, nor is there any engraving or markings of any kind on the cap or stem press. If anyone can help in narrowing it down, I'd be very grateful  

The oldest lamp I have that I know the date of for certain is this June 1950 GE 1000W incandescent lamp.

Edit: the oldest one that I can positively date now is a German WW2 blackout lamp, thanks to Rigo for this one 

Incandescent
tt 40w orange color 1980s
Tesla 100w 1990s
Fluorescent
Tesla FC DS 20W 1980s or 1990s