If you look closely, timfuest, just to the right of the L5 (5 lire), you may see a small anchor mint mark. There should also be an L or a P just to the left of the L5.
For your coin dated 1826, the mint marks do not matter as both carry catalog values that are equal, but sometimes mint marks matter. Here are typical catalog values for all dates and all mint marks of the 1, 2, and 5 Lire coins from the old Italian State of Sardinia, except as noted:
1 LIRE (22 mm diameter)
worn: $50 US dollars catalog value
average circulated: $140
well preserved: $500
fully uncirculated: $1200
Coins dated 1824 with an anchor catalog at $270 in average circulated and $1900 in fully uncirculated condition.
Coins dated 1828 with both an anchor and an A mint mark are very common in low grades; they catalog at $45 in average circulated condition.
Coins dated 1829 with an anchor are scarce, they catalog at $320 average circulated, $2200 fully uncirculated.
Coins dated 1832 with an anchor catalog at $600 average circulated.
Coins dated 1833 with an anchor are extremely rare - only 85 were ever made. They are worth thousands of dollars in any condition.
Coins dated 1835 with an anchor catalog at $1500(!) average circulated.
The following coins with an anchor mint mark (in addition to those listed above) are scarce and catalog at twice the common date values or even more: 1839, 1841, 1842, 1844, 1846, and 1849.
The following coins with an eagle mint mark are scarce and catalog at twice the common date values or even more: 1833, 1834, 1837, 1841, and 1844.
2 LIRE (27 mm diameter)
worn: $80 US dollars catalog value
average circulated: $250
well preserved: $1200
fully uncirculated: $3400
Coins dated 1828 with an anchor mint mark are worth $360 average circulated, $3800 fully uncirculated.
2L EAGLE HEAD:
worn: $100 US dollars catalog value
average circulated: $600
well preserved: $2000
fully uncirculated: $5000
Coins with the following dates: 1833, 1834, 1838, 1839, 1841, 1843, 1847, 1848 and 1849 with an eagle head mint mark are rare, and they are worth about $1000 in average circulated condition (zowie!), rising to above $6000 when fully uncirculated.
Coins dated 1835 and 1836 catalog at $5800 when fully uncirculated.
5 LIRE (39 mm diameter)
worn: $70 US dollars catalog value
average circulated: $200
well preserved: $200
fully uncirculated: $1500
Coins dated 1821 catalog for $500 when worn, most well preserved or better coins catalog above $3000.
Coins dated 1822 or 1823 (both with anchor) catalog around $400 when average circulated and above $3500 when fully uncirculated.
Coins dated 1824 (with anchor) catalog for $3000 in fully uncirculated condition.
Coins dated 1824 or 1825 (with an eagle mint mark) catalog for $900 in average circulated, above $6000 in fully uncirculated.
Coins dated 1831 with an anchor mint mark are worth about $2500 in average circulated condition, and a whopping $12,000 in fully uncirculated condition.
Remember that these are catalog values and are inflated over actual retail and wholesale values. For a definition of 'catalog value' please se our Important Terminology link.