For quick ID on what model it is, you can tell by looking at the rear sight. If it is a ladder type sight placed half way down the barrel you have a No.1 MK 3*. The * means it was made after changes to the design where made in 1916 to streamline production. If your rear sight is a peep sight on the rear of the receiver, you have No.4 MK 1 or MK 2. These rifles are also referred to as a SMLE or Short Magazine Lee Enfield. This doesn't mean that the magazine is short, but that the barrel is shorter than the No.1 MK 1 Long Lee. If your rifle has a conical flash suppressor than you have a No. 5, more commonly known as a "Jungle Carbine". Flip up the bolt handle and take a look at the collar band above the trigger guard this should tell you the country, arsenal, model, and year of manufacture. For example on my No.1 MK 3 we see;
MA
LITHGOW
SMLE
III*
1941
heres what that all means
MA- Made in Australia
LITHGOW- the government arsenal in Lithgow assembled this rifle
SMLE- Short Magazine Lee Enfield
III*- a SMLE incorporating the modifications of 1916
1941- year of manufacture
I believe a No.4 would look something like this;
CANADA
LONGBRANCH
NO4MK2(T)
1945
Im not to sure about that, someone else here can verify it. Note the T after the model number. This does not appear on all No.4s, but ones that where set aside for their accuracy and mounted with a Mk. 82 telescopic sight. Sometimes it wont always note what country it is made in so heres a fairly accurate list of arsenals and where theyre located (I think)
No.1 MK 3
Enfield- Enfield Small Arms Factory, England. Birthplace of the Lee-Enfield.
BSA- Birmingham Small Arms Factory, England. fairly accurate, well built.
Maltby- Maltby Arsenal, England.
Ishapore- Ishapore Small Arms Factory, India. General opinion of these rifles is that theyre junk. Some are good, I owned a Parker-Hale sporting conversion that was a tack driver at 200 yards.
Lithgow- Lithgow arsenal, Australia. Thought to be the most accurate of the Lee-Enfield family. My personal favorite. Very well built rifles. Some heavy barrel models built in the 1920s are still popular for long range shooting to this day.
No.4 MK1/MK2
Enfield- Enfield Small Arms Factory, England.
BSA- Birmingham Small Arms Factory, England.
Longbranch- Longbranch Arsenal, Canada. My national heritage.
Savage- Savage Arms Company, USA. Some dealers will charge more for these rifles because people think that because they are made in the US theyre worth more. Not true.
I know theres one or two more but forgot them at this moment. The No.5 Jungle Carbine was only made at the Fazackerly Arsenal, so if someone tries to sell you one and its not stamped FAZ, theyre lying.
Ill have more info later on. Hope this helps.
Kevin